\ifcmh%
	body of the environment body of the environment body of the environment
\fi
some more text

\ifcmh%
	#1<2 body of the environment body of the environment body of the environment
\fi
% comment!

\ifodd%
	\mynumber body of the environment body of the environment body of the environment
\fi
% comment!

here is some text
\if%
	x^2
\fi
text

\if%
	body %comment
\fi

\if% here's a comment
	body
\else
	else body
\fi
